And the SanDisk Extreme and Extreme Pro come close to real-world benchmarks and cost considerably less. Of our favorite microSD cards, the Lexar 1066x has just about the best speed ratings without costing an absolute fortune. But, of course, 10MB/s isn't very fast, which is evidence that some of these numbers are redundant or obsolete, and none of them give you a 100% accurate snapshot of an SD card's actual speed in real-world use. C10, for example, means a card can write large sequential files at 10 megabytes per second or faster. These refer to the minimum speeds a flash memory card can achieve instead of the maximum. Combinations of letters like U3, C10, UHS, and others grace the front of nearly every SD card on the planet. They offer high IOPS, good sequential read and write speeds, and the durability we've come to expect from Samsung flash memory.Īctually, not much.
If you are OK with something other than a top-of-the-line smartphone, the Samsung Evo Select and Evo Plus microSD cards are the best bang for your buck. In case you're absolutely attached to massive amounts of internal storage, be prepared to spend out the wazoo for a high-end flagship, or avoid flagships altogether and go for midrange or budget-friendly smartphones. That's why Samsung lets you upgrade to 256GB of storage on the Galaxy S23 for $60, while Apple asks for a hefty $100 for the same storage upgrade on the iPhone 14. Every 128GB of internal storage from microSD expansion is 128GB of storage that the phone manufacturer won't see any money from. Unlike some questionable choices in electronics design today, this is basically a conspiracy against the consumer, exclusively for profit. By comparison, they make plenty of scratch by selling multiple tiers of their flagship devices with varying levels of internal storage.
Unfortunately for consumers, smartphone manufacturers have discovered they don't make any money from microSD card expansion slots.
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